DM3730_11 Datasheet, PDF (244/280 Pages) Texas Instruments – Digital Media Processors

DM3730, DM3725
SPRS685D – AUGUST 2010 – REVISED JULY 2011
www.ti.com
Table 6-105. UART Switching Characteristics⁽²⁾ (continued)
SIGNAL NAME
MUX MODE
DESCRIPTION
MIN
MAX
UNIT
UART3 (uart3_tx_irtx): T27
2
t_R, Rise time
t_F, Fall time
C_L, Output load
Universal Asynchronous Receiver/Transmitter (UART4)
1.5
5.5
ns
2
22
pF
UART4 (uart4_tx): K8
2
t_R, Rise time
t_F, Fall time
C_L, Output load
0.6
2.4
ns
2
22
pF
(1) The mode is configured by bits SC0 and SC1 of the IO cell. For more details, see the AM/DM37x Multimedia Device Technical
Reference Manual (literature number SPRUGN4).
(2) Caution: Up to a rise time or a fall time of 1.2 ns, this can create EMI parasitics.
6.6.7.2 UART3 IrDA
The IrDA module can operate in three different modes:
• Slow infrared (SIR) (≤ 115.2 Kbits/s)
• Medium infrared (MIR) (0.576 Mbits/s and 1.152 Mbits/s)
• Fast infrared (FIR) (4 Mbits/s)
Pulse Duration
90%
90%
50%
50%
10%
t_r
t_f
Figure 6-64. UART IrDA Pulse Parameters
10%
SWPS038-093
6.6.7.2.1 UART3 IrDA—Receive Mode
SIR
2.4 Kbit/s
9.6 Kbit/s
19.2 Kbit/s
38.4 Kbit/s
57.6 Kbit/s
115.2 Kbit/s
MIR
0.576 Mbit/s
Table 6-106. UART3 IrDA Signaling Rate and Pulse Duration—Receive Mode
SIGNALING RATE
ELECTRICAL PULSE DURATION
MIN
TYP
MAX
52.17
13.10
6.59
3.34
2.25
1.17
78.13
19.53
9.77
4.88
3.26
1.63
208.33
52.08
26.04
13.02
8.68
4.34
300.55
416.67
867.86
UNIT
μs
μs
μs
μs
μs
μs
ns
244 Timing Requirements and Switching Characteristics
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